Adding web fonts to an Azure Website. Extensions .eot and .woff added via a transform. You need to make changes to both files for this transform to work. Always preview transform to validate.

Web.config

<?xml version="1.0" encoding="utf-8"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->
<configuration>  
  <system.webServer>
    <staticContent></staticContent>
  </system.webServer>
</configuration>

Web.Release.config

<?xml version="1.0" encoding="utf-8"?>

<!-- For more information on using web.config transformation visit http://go.microsoft.com/fwlink/?LinkId=125889 -->

<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
  <system.webServer>
    <staticContent>
      <remove fileExtension=".eot" xdt:Transform="Insert" />
      <mimeMap fileExtension=".eot" mimeType="application/vnd.ms-fontobject"  xdt:Transform="Insert" />
      <mimeMap fileExtension=".woff" mimeType="application/font-woff"  xdt:Transform="Insert" />
    </staticContent>
  </system.webServer>  
</configuration>